A double boiler isn't necessary if you keep the heat low enough so that it doesn't go above a simmer but most people are too impatient for that. . Here's one of my favorite oyster stew recipes for when I want a change from the basic. . OYSTERS ROCKEFELLER STEW – 4 servings . 4 slices bacon 1 cup thinly sliced leeks 1 cup thinly sliced celery 1/ 8 tsp. cayenne pepper 3 cups half-and-half 2 cups milk 1 1/ 2 pints shucked oysters and liquor 2 tsp. Worcestershire sauce 2 cups thinly sliced raw spinach leaves Salt and black pepper 1 Tbs. butter (optional) Oyster crackers to serve with stew . In a large heavy saucepan or soup kettle, fry the bacon until crisp. Drain on paper towel, crumble and reserve. Pour off all but 2 Tbs. of drippings from the skillet. . Add the leek and celery and saute over medium-low heat for 8-10 minutes, until the vegetables are softened. Stir in the cayenne pepper. . Add the half-and-half and the milk and bring to a simmer. Add the oysters (cut large ones in half) and the Worcestershire sauce. Return to a simmer. Stir in the spinach and simmer for about 5 minutes, until the spinach is just wilted and the oysters are cooked through. Add salt and pepper to taste. . Swirl in the optional butter, if used, and serve immediately in large, shallow bowls. Sprinkle each bowl with the reserved bacon.